I think that Cadsuane will teach Rand and the Ashaman restraint and how to use the power less. The more you use the power the quicker the Ashaman would go mad. So Cadsuane will teach them how to only use the Power when it is absolutely needed. This way the Ashaman will be able to stay sane until the Last Battle. About the self restraint. I think that she will teach Rand to hold onto his temper more. Pretty soon Rand might kill someone close like he almost did to Perrin.